1DH_SET_METHOD(3ossl)                OpenSSL               DH_SET_METHOD(3ossl)
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NAME

6       DH_set_default_method, DH_get_default_method, DH_set_method,
7       DH_new_method, DH_OpenSSL - select DH method
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SYNOPSIS

10        #include <openssl/dh.h>
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12       The following functions have been deprecated since OpenSSL 3.0, and can
13       be hidden entirely by defining OPENSSL_API_COMPAT with a suitable
14       version value, see openssl_user_macros(7):
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16        void DH_set_default_method(const DH_METHOD *meth);
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18        const DH_METHOD *DH_get_default_method(void);
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20        int DH_set_method(DH *dh, const DH_METHOD *meth);
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22        DH *DH_new_method(ENGINE *engine);
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24        const DH_METHOD *DH_OpenSSL(void);
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DESCRIPTION

27       All of the functions described on this page are deprecated.
28       Applications should instead use the provider APIs.
29
30       A DH_METHOD specifies the functions that OpenSSL uses for Diffie-
31       Hellman operations. By modifying the method, alternative
32       implementations such as hardware accelerators may be used. IMPORTANT:
33       See the NOTES section for important information about how these DH API
34       functions are affected by the use of ENGINE API calls.
35
36       Initially, the default DH_METHOD is the OpenSSL internal
37       implementation, as returned by DH_OpenSSL().
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39       DH_set_default_method() makes meth the default method for all DH
40       structures created later.  NB: This is true only whilst no ENGINE has
41       been set as a default for DH, so this function is no longer
42       recommended.  This function is not thread-safe and should not be called
43       at the same time as other OpenSSL functions.
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45       DH_get_default_method() returns a pointer to the current default
46       DH_METHOD.  However, the meaningfulness of this result is dependent on
47       whether the ENGINE API is being used, so this function is no longer
48       recommended.
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50       DH_set_method() selects meth to perform all operations using the key
51       dh.  This will replace the DH_METHOD used by the DH key and if the
52       previous method was supplied by an ENGINE, the handle to that ENGINE
53       will be released during the change. It is possible to have DH keys that
54       only work with certain DH_METHOD implementations (e.g. from an ENGINE
55       module that supports embedded hardware-protected keys), and in such
56       cases attempting to change the DH_METHOD for the key can have
57       unexpected results.
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59       DH_new_method() allocates and initializes a DH structure so that engine
60       will be used for the DH operations. If engine is NULL, the default
61       ENGINE for DH operations is used, and if no default ENGINE is set, the
62       DH_METHOD controlled by DH_set_default_method() is used.
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64       A new DH_METHOD object may be constructed using DH_meth_new() (see
65       DH_meth_new(3)).
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RETURN VALUES

68       DH_OpenSSL() and DH_get_default_method() return pointers to the
69       respective DH_METHODs.
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71       DH_set_default_method() returns no value.
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73       DH_set_method() returns nonzero if the provided meth was successfully
74       set as the method for dh (including unloading the ENGINE handle if the
75       previous method was supplied by an ENGINE).
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77       DH_new_method() returns NULL and sets an error code that can be
78       obtained by ERR_get_error(3) if the allocation fails. Otherwise it
79       returns a pointer to the newly allocated structure.
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SEE ALSO

82       DH_new(3), DH_new(3), DH_meth_new(3)
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HISTORY

85       All of these functions were deprecated in OpenSSL 3.0.
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88       Copyright 2000-2021 The OpenSSL Project Authors. All Rights Reserved.
89
90       Licensed under the Apache License 2.0 (the "License").  You may not use
91       this file except in compliance with the License.  You can obtain a copy
92       in the file LICENSE in the source distribution or at
93       <https://www.openssl.org/source/license.html>.
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973.1.1                             2023-08-31              DH_SET_METHOD(3ossl)
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